#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdlib.h>
int main()
{
    int pid,y,z;
    char *arg[1] = {0};

    pid = fork();
    if(pid == 0 ){
        printf("child Process\n");
       execv("hello world", arg);
       exit(0);
    }
    y = wait(&z);
    return 0;
}